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Which substance produces itching when released in response to allergens?

Allergen


What is the difference between feedback negative feedback a negative feedback response a negative feedback mechanism and a negative feed back loop?

in negative feedback. when an enzyme (negative feed back mechanism) produces too much of a molecule or substance that substance binds to the enzymes allosteric site to hault production of that substance (negative feedback response). and the whole process is the negative feedback loop.


What is it called when a substance changes color in response to pH?

This is a pH indicator.


The brainstem regulates breathing and will signal the diaphragm to contract in response to?

The brainstem regulates breathing by sending signals to the diaphragm to contract and expand. It does this in response to changes in carbon dioxide levels in the blood detected by chemoreceptors. When carbon dioxide levels rise, the brainstem signals the diaphragm to contract more frequently to increase breathing rate and oxygen intake.


What substance regulates fight or flight response?

The fight or flight response is primarily regulated by the hormone adrenaline (also known as epinephrine), which is released by the adrenal glands in response to stress. This hormone prepares the body to react quickly to perceived threats by increasing heart rate, dilating airways, and redirecting blood flow to essential muscles. Additionally, cortisol, another hormone released during stress, helps sustain the body's response over a longer period. Together, these substances coordinate the physiological changes necessary for survival in dangerous situations.